Michael Jackson has reportedly only managed two rehearsals for his comeback tour this summer.

The pop star has been described as being "in a stupor" which has increased fears his tour could be scrapped altogether.

Jackson has already postponed the opening four nights at London's O2 Arena saying he needed more time to prepare for the show's "size and scope".

But speaking to British newspaper The Daily Mail, a source said: "The suggestion that they need more time to set up the show in London is a joke.

"I think the fans who have already bought tickets should hold their breath and cross their fingers, because there is no guarantee any of this is actually going to happen.

"There is a possibility that this will still happen, but it is up to him to get his act together.

"Michael has only been to two days of rehearsals for the show. His dancers have been working on it every single day for 45 days at the Shrine Auditorium in Los Angeles, but Michael has been nowhere to be found."